Handpiece for dental purposes



Feb. 18, 1930. w pANNw1|-z f 1,747,947

HANDPIECE FR DENTAL PURPOSES' Filed July 25, 1928 2 Sheets-Sheet l w. PANNwlTz 1,747,947

Sheets-Sheet 2 daim@ Z i Feb. 18, 1930.

HANDPIEGE FOR DENTAL PURPOSES -Filed .my 25, ma

i ,4 Patented Feb. 18, 1930 WiLHELM lPANNWITZ, or BnRLm-coPnNIcx,

GERMANY, ,ASSIG-NR Tt) 1DElII'TJJSCHE Gonn- UND,sILBERscHEInEANsTALT, or raANKroRT-oNJrHaMaIN, GERMANY* Y HANDPIECEFQR DENTAL PURPOSES Application med .my 23, 192s. serial No. 294,392.

This invention, which has been; partlydei scribed in my prior application lSerial No.

208,649 filed July 2 6',` 1927, relates to hand i, supported dental tools, whichL usually com- 1 '5 prise a toolholder adjustably mounted in a easingvand adapted to be driven when necessary by'suitable driving means. j'The tool holder usuall'yhasa slightly coni- "cal forward end bearingin the ycorrespond- Y ljinglyshaped tront'o'fthe casing, and is yadjfustd by means 0fa`pin-shaped screw situated at the rear end of the casing with its axis parallel to the axis of the casing, atlange or projection onthe tool holder limiting the "1'5 forwardmovement thereof.

The manipulation ofthis device inthe adjustment of the screw is always tedious, as the casing must be removed entirelyy and a special screw, driver be used', rIhe smalll and 2,0 delicate screw iseasily damaged so that it no longer fits in the correspondir'ig recesses in the flange ofthe tool holder.

y, yThe object ofthe invention is to avoid the above diiiiculties, in other words to render manipulate l y According tothe invention the adjustment of the tool'liolder inthe casing is limited member for instance a screw threaded ringforthe like, on orV in the casing, which can be rotated'about the axis of the casing, preferably concentrically in relation thereto. Two formsof aliand-tool according to the l invention are illustrated. in the accompanying drawings, wherein l `Figure l viskan outside view of the complete i Y Figure 2, is apart sectional view of' the Y y Fglres 3 ande-are, respectively, 2111 'end view'ot the adjusting ring and a side sec,- tional view of the-,nut5 l Y Figure is a sidesectional view corresponding to Figi, v y

Figure 6 isa side view ef` the hand tool with the nut. andv casing` removed,

Figure 7 showsl on an enlarged scale the parts which control the position of the tool Carrier, v

' the hand dental tool simpler and easier to tool in elevation, f f y Figure 9'shows a partial section of Fig. 8, Figure 10"shows a detail partially in section.

'In the form illustrated in Figs. 1-7 the casing a, which has at its forward end an internal conical bearing face b, is provided at its rear with a screw thread c, upon which Figure 8 shows the second form' of the hand 4aninternallyscrew threaded ring cl or the likecanv be adjusted. The screw threaded part c has a slot e.

The tool holder f, which is driven in the ordinary manner (not illustrated) is conical at its forward end similar to the bearing face Z2. It rotates in the casing, a portion of it extending, for example, into the sliding connecting sleeve Z. rPhe latter is provided with a screw threaded part L and also with a rib z' which `is disposed in the axialdirection of the tool holder /f andfits intofthe slot e of the screwthreaded parte' of the casing a. The

sleeve vZ and the casing a' are connected together by aY nut/s surroundingk the casing and screwing on the .thread of they sleeve Z, The nut lc is advantageously of a diameter which is not substantially greater than that of the part a of the casing so that the tool lies comfortably in the hand during use.

In the form `illustrated in Figures 8-10 the sleeve a of the hand piece having the front cone b is provided at the rear end with a screwl threadc on which is axially seated the screwed ringd. `In the portion of the sleeve not the hand piece provided with the screw thread lc'is provided aslot e in which is guided astop ron the part mot the-handle sleeve, which in combination with the screwed ringd adjusts the? forward movement of the tool holder f in the sleeve a of the hand piecell Thepart mof the handlefsleeve and the sleeve a of the hand piece are connected together by an external nut 7e which is screwed on the screw threadlv of the part m v of the handle sleeve tog such an extent 'as is permitted by the stop; i. in. combination with the screwedringd. l l

\ The tool holder is of the construetion Usual nrhand pieces For Clmpngthe toom the clamping. sleeve 1 et. the tool: carrier f 1' there is provided a cam lever Q, pivoted at 79, on the lower end r of whioh'aets a wedge shaped rack s. By tiltingl the lever g, which is e'eeted by axially moving the rwedge shapedrack s, the cam t operates through the sliding vpart v is withdrawn from the Ysleeve l1, of the hand piece, for removingthe -tool a, the external nut 76 is extended tosuclx a distance beyond the screw vthread/w that the sliding part o is also completely covered in the l,withdrawn position by the extension m of the external nut c. The ribbing` or milling o provided in the externalnut for the application of a tool for the purpose of releaslngthe external nut 7e from the handleV sleeve portion m, is provided on this extension of the external nut. itself so that the screw thread w is not damaged 'when applying'atool.V

The position ofthe tool holder fin the casing a is regulated in both cases as follows: The nut 7c is unscrewed from vthe thread h and drawn back so far, that the ring l is free. In Figure 7the position of the drawn back nut 7s is'indicated by the dotted lines. The ring Z isithen screwed by hand into-the desired position on the threaded part. c of the lcasing a, upon which position depends the position of the tool holder f in the casing a; as the ring d limits the forward movement of therib solid with the sleeve Z, pushing forward the tool holder f into the casing a.

-Vhen the tool holder 7 has got the-desired position in the casing a, the nut sV is drawn Y prising a casing, anut axially movable on u forward and screwed on the thread h ofthe sleeve Z.-

1. A hand piece for dental purposes comprising'a casing, a sleeve removably secured to said casing, a tool holder rotatablyarranged in said casing and said'sleeve,`a screwthread on thexvend of saidcasing, an internally screw threaded ring Aaxially movable on said screw-thread of said'casing and a projection on said sleeve cooperating with said ring' 1n order tolimit the forward movement Yof said` sleeve pushing said tool holderforwardinto said casing.l

2. A hand piece for dental'purposes 'com-4 prising acasing, a sleeve removably secured to sald casing, a tool'holder rotatably arranged in said casing and said sleeve, a screw Vthread on the end of said casing, an internally screw-threadedring axially movable on-sa-id. screw-thread, a slot in' said screwthreaded end of said Casing, a rib entering said slot on said sleeve in order to limit the Q vforward movement of said sleeve pushing` said tool holder forward into said casing;

@..A yhand piece forv dental purposes comprising acasing, a nut axially Ymovable on saidrasing, a screw-thread on the end of said casing under said nut, an internally screw-threaded ring axially movable on said. screw-thread, a sleeve connected to said casing by said nut, a tooll holder in said casing and said sleeve and a rib on said sleeve cooperating with said ring, thereby limiting Y i the forward movement of said sleeve pushing Vsaid tool holder into said casing. i

1l. A hand piece for ydental purposes comprising ya easing, a nut ofkr only a slightly greater ydiameter than that of said casing axiallymovable on vsaidfkcasing, a screwthread on ythe end of said casing under said nut, an internally screw-threaded ring axialn ly movable on said screw-thread@ sleeve con-Y nected to said casing by saidnut, a tool holder in said casing and said sleeve and a rib on said sleeve cooperating with said jring, thereby limiting the forward movement of 4said sleevefpushing said tool holder intosaid casing. y y n. 5. Al hand piece for dental purposes comprising a casing', a nut .axially movablel on into said casing, an axially and partially withdrawable clamping devieein said tool holder and a tubular extension on said nut, covering said withdrawablev part ofthe clamping device in the withdrawn position.

6. A hand piecefor dental purposes comsaid casing, a screw-thread ontheend of said casing undersaid nut, an internally screwthreaded ring axiallymovable on said'screwthread, a sleeve connected yto said easing by said nut, a tool holder in said sleeve and said casing, a rib on said sleeve cooperating with said'ring, thereby limiting the forward movenient of said `sleeve pushing saidtoolho'lder into said casing`v an axially and'partiallyA withdrawable clamping device in said. tool holder, a tubular extension kon said ynut and covering said withdrawable part of the WILHELM 'PANNVITZ rlao' (clamping device in the withdrawn position and an externalribbingl on said extension ofy f 

